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Download Chemical Physics of Solid Surfaces and Heterogeneous by D. A. King PDF

By D. A. King

The e-book is a multi-author survey (in 15 chapters) of the present country of data and up to date advancements in our knowing of oxide surfaces. the writer record comprises lots of the said international specialists during this box. the cloth coated contains basic conception and experimental stories of the geometrical, vibrational and digital constitution of such surfaces, yet with a distinct emphasis at the chemical homes and linked reactivity. the main target is on steel oxides yet insurance extends from 'simple' rocksalt fabrics similar to MgO via to advanced transition steel oxides with diversified valencies.

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Needless to say, the rocksalt (111) surface is not stable; it must either reconstruct or be stabilized by the presence of charged species adsorbed on the surface. If an ionic crystal has two opposite polar faces, then, in order for the total crystal to be charge neutral, the two opposing faces must be of opposite types. This effect can readily be observed macroscopically; a well known case is ZnO. ZnO has a tetrahedrally coordinated wurtzite crystal structure; in the [0001] direction, it consists of alternating planes of Zn^^ and O^' ions [1].

Henrich, J. Phys. Chem. (in press). P. Woodruff, editor © 2001 Elsevier Science B. V. All rights reserved. 35 Chapter 2 Clean Oxide Surfaces: a theoretical review Claudine Noguera Laboratoire de Physique des Solides, UMR CNRS 8502, Universite Paris-Sud, 91405 Orsay, France 1. I N T R O D U C T I O N The last five years have witnessed a tremendous effort to better produce, characterise and study insulating oxide surfaces. Several reasons stem for the rapid development of this field. They are related to experimental considerations — a better control of the fabrication of surfaces, a more thorough use of advanced spectroscopic or structural tools — but also to a more accurate recognition of the technological importance of high quality oxide surfaces in catalysis, magnetic recording, as sensors or as constituents of artificial nano-materials.

This is shown as the heavy curve in the UPS spectra in Fig. 8(a). The other curves in Fig. 8(a) show how the spectrum changes when the stoichiomet- 27 Clean surface 100 L CO 103 L CO N(E) AN(E) Binding Energy [eV] Fig. 8. 8 eV). (b) Differences created by subtracting the clean surface spectrum from the CO-exposed spectra. ric, low-defect-density surface is exposed to the amounts of CO indicated at room temperature. Up to 10^ L, there is virtually no effect on the spectra; this can be seen most clearly in the difference spectra (where the clean-surface spectrum is subtracted from each of the other spectra) in Fig.

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